Abstract: The permanent deformation characteristics of the graded gravel f1exible base precast block pavement were tested by the full-scale indoor ring road tes t. And the inf1uence of joint width , sand cushion thickness , block thickness and loading times on the precast block pavement permanent deformation was also analyzed. The results show that the absolute value of the joint width variation is less than 2 mm under the load; there is a positive correlation between joint width and final permanent deformation; the right joint width is 3 - 8 mm; in the case of the same joint width , the thickness of the sand cushion inserts for precast block paving squeeze have no impact on the formation of the state , but have impact on the size of permanent deformation for the final pavement. Then the appropriate sand cushion thickness is 2 - 5 cm. Block thickness has little inf1uence on pavement permanent deformation. And the relationship between permanent deformation L and load times N for the precast concrete block pavement was then established.

Key words: road engineering, precast block pavement, ring road test, permanent deformation, prediction model

摘要： 通过室内足尺环道试验测试了级配碎石柔性基层预制块铺面永久变形特性，研究了平整度和接缝宽度随荷载作用次数的变化规律，分析了接缝宽度，砂垫层厚度，块体厚度和荷载作用次数对预制块铺面永久变形的影响。试验结果表明：在荷载作用下预制块铺面接缝宽度变化的绝对数值未超过2 mm；接缝宽度与预制块铺面最终永久变形量成正相关；试验结果表明适宜的接缝宽度为3~8 mm；在接缝宽度相同的情况下，不同砂垫层厚度的预制块铺面几乎都是在5万次荷载作用时出现稳定的嵌挤状态，表明砂垫层厚度对预制块铺面嵌挤状态的形成没有影响，但会影响铺面最终永久变形量大小，根据试验结果，适宜的砂垫层厚为2~5 cm。块体厚度对于铺面永久变形的影响很小，块体厚度增加了1倍，而铺面永久变形只减少了10%。基于室内试验结果，建立了混凝土预制块铺面的永久变形L与荷载作用次数N之间的关系。

关键词: 道路工程, 预制块铺面, 环道试验, 永久变形, 衰变模型